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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b2ad5d6aacb7974131db383f996c114a7e80a739f7618765a29279d333fd20' 
  AND token = 'ZPunwpN0610gsu3+oy7pAnX4zccmibp8yC4TAzXE/b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}